From patchwork Wed Jan 27 17:01:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 12050585 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3D2EC433E9 for ; Wed, 27 Jan 2021 16:55:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D00F64D9E for ; Wed, 27 Jan 2021 16:55:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234081AbhA0QzE (ORCPT ); Wed, 27 Jan 2021 11:55:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47544 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233825AbhA0QyU (ORCPT ); Wed, 27 Jan 2021 11:54:20 -0500 Received: from mail-wm1-x32f.google.com (mail-wm1-x32f.google.com [IPv6:2a00:1450:4864:20::32f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A531C061574 for ; Wed, 27 Jan 2021 08:53:39 -0800 (PST) Received: by mail-wm1-x32f.google.com with SMTP id e15so2286612wme.0 for ; Wed, 27 Jan 2021 08:53:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=5LKEwNd0woDrm/FI4/GE1OIO9In2ycXgwHk8R+XlR18=; b=y/mZU9k/xDVKhuFr7ASa4Kua81/qVwswTjEHpFQDQwxWO5WoN9hQAOMMLgJcSBQq6V pPyexjHsSGy2jmJ70Y43xqoZ+8KStH6NYEMLvju+FGSJA44npkW4m9woiZq8VcbIBkj/ 1PW/GsZG3M+Iw/1sUIQ0AC+pdv2nOJLzUzQ/nNPXOEyzVWfMLOESIHJdpGOopLBaZrDE xQdjvdoWd4KNWsgO1LHcPx7ceEXw4G3t3QUd86nty/2ZpEuX12mv4qv87GroUi8t/3rb DFw9Suw/saL4LZqB5iNs5FzxcMyq4RWC3+LaeOaflozi1HsgfWfOU7iK+J1OldhT8Tmx 1kLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=5LKEwNd0woDrm/FI4/GE1OIO9In2ycXgwHk8R+XlR18=; b=F4u2Q8a5K+6zO9YlQFJNWjLIg8a/Hqk5DQZDRPG3sTqZwEY/R363puOuZqLOjfP0E/ dqr0R9Rxa6T3KJLKwOxpNeikEzEBmCbpUoqGx4sMQIApgS/Ojqvvj5rVf//ERW1yZO22 fMm14os0CVQvrGzTeHuWW7gv58cEbACdwK0JtlYpa2NC08PoEv1vNxLsjQFG3A8vxt+j hVW3Eutw5jJIZLZBjgRAdgFoADS9xyOERVgUQ6lwJHfnjd22/ok+JB9tnedumnO9zzFu x+d7Gi4eE364kVEKICzzQwtCgHwGJr7TuLxzCf97WTHQkq2YiAXFcD9wTaVoO/NGUkgb pTLQ== X-Gm-Message-State: AOAM5327UXAOSdWH1kmw7zf0DAWxAkEkR0ElFXkep8/DiJldrJ/OoEwG FDOabU0NtNNTcsUSYGrQo69mJg== X-Google-Smtp-Source: ABdhPJyalz3FU9EWSttgBFUd98dJQEaadHPMuh738dHskmN/SKqurJJheFEMbd14dqNPPG5b/tn6eA== X-Received: by 2002:a1c:a90f:: with SMTP id s15mr5081210wme.154.1611766418020; Wed, 27 Jan 2021 08:53:38 -0800 (PST) Received: from localhost.localdomain ([88.122.66.28]) by smtp.gmail.com with ESMTPSA id m82sm3077042wmf.29.2021.01.27.08.53.36 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Jan 2021 08:53:37 -0800 (PST) From: Loic Poulain To: kuba@kernel.org, davem@davemloft.net Cc: netdev@vger.kernel.org, carl.yin@quectel.com, Loic Poulain Subject: [PATCH net-next 2/3] net: mhi: Add dedicated folder Date: Wed, 27 Jan 2021 18:01:16 +0100 Message-Id: <1611766877-16787-2-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1611766877-16787-1-git-send-email-loic.poulain@linaro.org> References: <1611766877-16787-1-git-send-email-loic.poulain@linaro.org> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Create a dedicated mhi directory for mhi-net, mhi-net is going to be split into differente files (for additional protocol support). Signed-off-by: Loic Poulain --- drivers/net/Makefile | 2 +- drivers/net/mhi/Makefile | 3 + drivers/net/mhi/net.c | 379 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/net/mhi_net.c | 379 ----------------------------------------------- 4 files changed, 383 insertions(+), 380 deletions(-) create mode 100644 drivers/net/mhi/Makefile create mode 100644 drivers/net/mhi/net.c delete mode 100644 drivers/net/mhi_net.c diff --git a/drivers/net/Makefile b/drivers/net/Makefile index 36e2e41..f4990ff 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -36,7 +36,7 @@ obj-$(CONFIG_GTP) += gtp.o obj-$(CONFIG_NLMON) += nlmon.o obj-$(CONFIG_NET_VRF) += vrf.o obj-$(CONFIG_VSOCKMON) += vsockmon.o -obj-$(CONFIG_MHI_NET) += mhi_net.o +obj-$(CONFIG_MHI_NET) += mhi/ # # Networking Drivers diff --git a/drivers/net/mhi/Makefile b/drivers/net/mhi/Makefile new file mode 100644 index 0000000..0acf989 --- /dev/null +++ b/drivers/net/mhi/Makefile @@ -0,0 +1,3 @@ +obj-$(CONFIG_MHI_NET) += mhi_net.o + +mhi_net-y := net.o diff --git a/drivers/net/mhi/net.c b/drivers/net/mhi/net.c new file mode 100644 index 0000000..aa3a5e0 --- /dev/null +++ b/drivers/net/mhi/net.c @@ -0,0 +1,379 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* MHI Network driver - Network over MHI bus + * + * Copyright (C) 2020 Linaro Ltd + */ + +#include +#include +#include +#include +#include +#include +#include + +#define MHI_NET_MIN_MTU ETH_MIN_MTU +#define MHI_NET_MAX_MTU 0xffff +#define MHI_NET_DEFAULT_MTU 0x4000 + +struct mhi_net_stats { + u64_stats_t rx_packets; + u64_stats_t rx_bytes; + u64_stats_t rx_errors; + u64_stats_t rx_dropped; + u64_stats_t tx_packets; + u64_stats_t tx_bytes; + u64_stats_t tx_errors; + u64_stats_t tx_dropped; + atomic_t rx_queued; + struct u64_stats_sync tx_syncp; + struct u64_stats_sync rx_syncp; +}; + +struct mhi_net_dev { + struct mhi_device *mdev; + struct net_device *ndev; + const struct mhi_net_proto *proto; + void *proto_data; + struct delayed_work rx_refill; + struct mhi_net_stats stats; + u32 rx_queue_sz; +}; + +struct mhi_net_proto { + int (*init)(struct mhi_net_dev *dev); + struct sk_buff * (*tx_fixup)(struct net_device *ndev, struct sk_buff *skb); + int (*rx_fixup)(struct net_device *ndev, struct sk_buff *skb); +}; + +struct mhi_device_info { + const char *netname; + const struct mhi_net_proto *proto; +}; + +static int mhi_ndo_open(struct net_device *ndev) +{ + struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); + + /* Feed the rx buffer pool */ + schedule_delayed_work(&mhi_netdev->rx_refill, 0); + + /* Carrier is established via out-of-band channel (e.g. qmi) */ + netif_carrier_on(ndev); + + netif_start_queue(ndev); + + return 0; +} + +static int mhi_ndo_stop(struct net_device *ndev) +{ + struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); + + netif_stop_queue(ndev); + netif_carrier_off(ndev); + cancel_delayed_work_sync(&mhi_netdev->rx_refill); + + return 0; +} + +static int mhi_ndo_xmit(struct sk_buff *skb, struct net_device *ndev) +{ + struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); + const struct mhi_net_proto *proto = mhi_netdev->proto; + struct mhi_device *mdev = mhi_netdev->mdev; + int err; + + if (proto && proto->tx_fixup) { + skb = proto->tx_fixup(mhi_netdev->ndev, skb); + if (unlikely(!skb)) + goto exit_drop; + } + + err = mhi_queue_skb(mdev, DMA_TO_DEVICE, skb, skb->len, MHI_EOT); + if (unlikely(err)) { + net_err_ratelimited("%s: Failed to queue TX buf (%d)\n", + ndev->name, err); + dev_kfree_skb_any(skb); + goto exit_drop; + } + + if (mhi_queue_is_full(mdev, DMA_TO_DEVICE)) + netif_stop_queue(ndev); + + return NETDEV_TX_OK; + +exit_drop: + u64_stats_update_begin(&mhi_netdev->stats.tx_syncp); + u64_stats_inc(&mhi_netdev->stats.tx_dropped); + u64_stats_update_end(&mhi_netdev->stats.tx_syncp); + + return NETDEV_TX_OK; +} + +static void mhi_ndo_get_stats64(struct net_device *ndev, + struct rtnl_link_stats64 *stats) +{ + struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); + unsigned int start; + + do { + start = u64_stats_fetch_begin_irq(&mhi_netdev->stats.rx_syncp); + stats->rx_packets = u64_stats_read(&mhi_netdev->stats.rx_packets); + stats->rx_bytes = u64_stats_read(&mhi_netdev->stats.rx_bytes); + stats->rx_errors = u64_stats_read(&mhi_netdev->stats.rx_errors); + stats->rx_dropped = u64_stats_read(&mhi_netdev->stats.rx_dropped); + } while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.rx_syncp, start)); + + do { + start = u64_stats_fetch_begin_irq(&mhi_netdev->stats.tx_syncp); + stats->tx_packets = u64_stats_read(&mhi_netdev->stats.tx_packets); + stats->tx_bytes = u64_stats_read(&mhi_netdev->stats.tx_bytes); + stats->tx_errors = u64_stats_read(&mhi_netdev->stats.tx_errors); + stats->tx_dropped = u64_stats_read(&mhi_netdev->stats.tx_dropped); + } while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.tx_syncp, start)); +} + +static const struct net_device_ops mhi_netdev_ops = { + .ndo_open = mhi_ndo_open, + .ndo_stop = mhi_ndo_stop, + .ndo_start_xmit = mhi_ndo_xmit, + .ndo_get_stats64 = mhi_ndo_get_stats64, +}; + +static void mhi_net_setup(struct net_device *ndev) +{ + ndev->header_ops = NULL; /* No header */ + ndev->type = ARPHRD_RAWIP; + ndev->hard_header_len = 0; + ndev->addr_len = 0; + ndev->flags = IFF_POINTOPOINT | IFF_NOARP; + ndev->netdev_ops = &mhi_netdev_ops; + ndev->mtu = MHI_NET_DEFAULT_MTU; + ndev->min_mtu = MHI_NET_MIN_MTU; + ndev->max_mtu = MHI_NET_MAX_MTU; + ndev->tx_queue_len = 1000; +} + +static void mhi_net_dl_callback(struct mhi_device *mhi_dev, + struct mhi_result *mhi_res) +{ + struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev); + const struct mhi_net_proto *proto = mhi_netdev->proto; + struct sk_buff *skb = mhi_res->buf_addr; + int remaining; + + remaining = atomic_dec_return(&mhi_netdev->stats.rx_queued); + + if (unlikely(mhi_res->transaction_status)) { + dev_kfree_skb_any(skb); + + /* MHI layer stopping/resetting the DL channel */ + if (mhi_res->transaction_status == -ENOTCONN) + return; + + u64_stats_update_begin(&mhi_netdev->stats.rx_syncp); + u64_stats_inc(&mhi_netdev->stats.rx_errors); + u64_stats_update_end(&mhi_netdev->stats.rx_syncp); + } else { + u64_stats_update_begin(&mhi_netdev->stats.rx_syncp); + u64_stats_inc(&mhi_netdev->stats.rx_packets); + u64_stats_add(&mhi_netdev->stats.rx_bytes, mhi_res->bytes_xferd); + u64_stats_update_end(&mhi_netdev->stats.rx_syncp); + + switch (skb->data[0] & 0xf0) { + case 0x40: + skb->protocol = htons(ETH_P_IP); + break; + case 0x60: + skb->protocol = htons(ETH_P_IPV6); + break; + default: + skb->protocol = htons(ETH_P_MAP); + break; + } + + skb_put(skb, mhi_res->bytes_xferd); + + if (proto && proto->rx_fixup) + proto->rx_fixup(mhi_netdev->ndev, skb); + else + netif_rx(skb); + } + + /* Refill if RX buffers queue becomes low */ + if (remaining <= mhi_netdev->rx_queue_sz / 2) + schedule_delayed_work(&mhi_netdev->rx_refill, 0); +} + +static void mhi_net_ul_callback(struct mhi_device *mhi_dev, + struct mhi_result *mhi_res) +{ + struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev); + struct net_device *ndev = mhi_netdev->ndev; + struct mhi_device *mdev = mhi_netdev->mdev; + struct sk_buff *skb = mhi_res->buf_addr; + + /* Hardware has consumed the buffer, so free the skb (which is not + * freed by the MHI stack) and perform accounting. + */ + dev_consume_skb_any(skb); + + u64_stats_update_begin(&mhi_netdev->stats.tx_syncp); + if (unlikely(mhi_res->transaction_status)) { + + /* MHI layer stopping/resetting the UL channel */ + if (mhi_res->transaction_status == -ENOTCONN) { + u64_stats_update_end(&mhi_netdev->stats.tx_syncp); + return; + } + + u64_stats_inc(&mhi_netdev->stats.tx_errors); + } else { + u64_stats_inc(&mhi_netdev->stats.tx_packets); + u64_stats_add(&mhi_netdev->stats.tx_bytes, mhi_res->bytes_xferd); + } + u64_stats_update_end(&mhi_netdev->stats.tx_syncp); + + if (netif_queue_stopped(ndev) && !mhi_queue_is_full(mdev, DMA_TO_DEVICE)) + netif_wake_queue(ndev); +} + +static void mhi_net_rx_refill_work(struct work_struct *work) +{ + struct mhi_net_dev *mhi_netdev = container_of(work, struct mhi_net_dev, + rx_refill.work); + struct net_device *ndev = mhi_netdev->ndev; + struct mhi_device *mdev = mhi_netdev->mdev; + int size = READ_ONCE(ndev->mtu); + struct sk_buff *skb; + int err; + + while (atomic_read(&mhi_netdev->stats.rx_queued) < mhi_netdev->rx_queue_sz) { + skb = netdev_alloc_skb(ndev, size); + if (unlikely(!skb)) + break; + + err = mhi_queue_skb(mdev, DMA_FROM_DEVICE, skb, size, MHI_EOT); + if (unlikely(err)) { + net_err_ratelimited("%s: Failed to queue RX buf (%d)\n", + ndev->name, err); + kfree_skb(skb); + break; + } + + atomic_inc(&mhi_netdev->stats.rx_queued); + + /* Do not hog the CPU if rx buffers are consumed faster than + * queued (unlikely). + */ + cond_resched(); + } + + /* If we're still starved of rx buffers, reschedule later */ + if (unlikely(!atomic_read(&mhi_netdev->stats.rx_queued))) + schedule_delayed_work(&mhi_netdev->rx_refill, HZ / 2); +} + +static struct device_type wwan_type = { + .name = "wwan", +}; + +static int mhi_net_probe(struct mhi_device *mhi_dev, + const struct mhi_device_id *id) +{ + const struct mhi_device_info *info = (struct mhi_device_info *)id->driver_data; + struct device *dev = &mhi_dev->dev; + struct mhi_net_dev *mhi_netdev; + struct net_device *ndev; + int err; + + ndev = alloc_netdev(sizeof(*mhi_netdev), info->netname, + NET_NAME_PREDICTABLE, mhi_net_setup); + if (!ndev) + return -ENOMEM; + + mhi_netdev = netdev_priv(ndev); + dev_set_drvdata(dev, mhi_netdev); + mhi_netdev->ndev = ndev; + mhi_netdev->mdev = mhi_dev; + mhi_netdev->proto = info->proto; + SET_NETDEV_DEV(ndev, &mhi_dev->dev); + SET_NETDEV_DEVTYPE(ndev, &wwan_type); + + /* All MHI net channels have 128 ring elements (at least for now) */ + mhi_netdev->rx_queue_sz = 128; + + INIT_DELAYED_WORK(&mhi_netdev->rx_refill, mhi_net_rx_refill_work); + u64_stats_init(&mhi_netdev->stats.rx_syncp); + u64_stats_init(&mhi_netdev->stats.tx_syncp); + + /* Start MHI channels */ + err = mhi_prepare_for_transfer(mhi_dev); + if (err) + goto out_err; + + err = register_netdev(ndev); + if (err) + goto out_err; + + if (mhi_netdev->proto) { + err = mhi_netdev->proto->init(mhi_netdev); + if (err) + goto out_err_proto; + } + + return 0; + +out_err_proto: + unregister_netdev(ndev); +out_err: + free_netdev(ndev); + return err; +} + +static void mhi_net_remove(struct mhi_device *mhi_dev) +{ + struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev); + + unregister_netdev(mhi_netdev->ndev); + + mhi_unprepare_from_transfer(mhi_netdev->mdev); + + free_netdev(mhi_netdev->ndev); +} + +static const struct mhi_device_info mhi_hwip0 = { + .netname = "mhi_hwip%d", +}; + +static const struct mhi_device_info mhi_swip0 = { + .netname = "mhi_swip%d", +}; + +static const struct mhi_device_id mhi_net_id_table[] = { + /* Hardware accelerated data PATH (to modem IPA), protocol agnostic */ + { .chan = "IP_HW0", .driver_data = (kernel_ulong_t)&mhi_hwip0 }, + /* Software data PATH (to modem CPU) */ + { .chan = "IP_SW0", .driver_data = (kernel_ulong_t)&mhi_swip0 }, + {} +}; +MODULE_DEVICE_TABLE(mhi, mhi_net_id_table); + +static struct mhi_driver mhi_net_driver = { + .probe = mhi_net_probe, + .remove = mhi_net_remove, + .dl_xfer_cb = mhi_net_dl_callback, + .ul_xfer_cb = mhi_net_ul_callback, + .id_table = mhi_net_id_table, + .driver = { + .name = "mhi_net", + .owner = THIS_MODULE, + }, +}; + +module_mhi_driver(mhi_net_driver); + +MODULE_AUTHOR("Loic Poulain "); +MODULE_DESCRIPTION("Network over MHI"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c deleted file mode 100644 index aa3a5e0..0000000 --- a/drivers/net/mhi_net.c +++ /dev/null @@ -1,379 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* MHI Network driver - Network over MHI bus - * - * Copyright (C) 2020 Linaro Ltd - */ - -#include -#include -#include -#include -#include -#include -#include - -#define MHI_NET_MIN_MTU ETH_MIN_MTU -#define MHI_NET_MAX_MTU 0xffff -#define MHI_NET_DEFAULT_MTU 0x4000 - -struct mhi_net_stats { - u64_stats_t rx_packets; - u64_stats_t rx_bytes; - u64_stats_t rx_errors; - u64_stats_t rx_dropped; - u64_stats_t tx_packets; - u64_stats_t tx_bytes; - u64_stats_t tx_errors; - u64_stats_t tx_dropped; - atomic_t rx_queued; - struct u64_stats_sync tx_syncp; - struct u64_stats_sync rx_syncp; -}; - -struct mhi_net_dev { - struct mhi_device *mdev; - struct net_device *ndev; - const struct mhi_net_proto *proto; - void *proto_data; - struct delayed_work rx_refill; - struct mhi_net_stats stats; - u32 rx_queue_sz; -}; - -struct mhi_net_proto { - int (*init)(struct mhi_net_dev *dev); - struct sk_buff * (*tx_fixup)(struct net_device *ndev, struct sk_buff *skb); - int (*rx_fixup)(struct net_device *ndev, struct sk_buff *skb); -}; - -struct mhi_device_info { - const char *netname; - const struct mhi_net_proto *proto; -}; - -static int mhi_ndo_open(struct net_device *ndev) -{ - struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); - - /* Feed the rx buffer pool */ - schedule_delayed_work(&mhi_netdev->rx_refill, 0); - - /* Carrier is established via out-of-band channel (e.g. qmi) */ - netif_carrier_on(ndev); - - netif_start_queue(ndev); - - return 0; -} - -static int mhi_ndo_stop(struct net_device *ndev) -{ - struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); - - netif_stop_queue(ndev); - netif_carrier_off(ndev); - cancel_delayed_work_sync(&mhi_netdev->rx_refill); - - return 0; -} - -static int mhi_ndo_xmit(struct sk_buff *skb, struct net_device *ndev) -{ - struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); - const struct mhi_net_proto *proto = mhi_netdev->proto; - struct mhi_device *mdev = mhi_netdev->mdev; - int err; - - if (proto && proto->tx_fixup) { - skb = proto->tx_fixup(mhi_netdev->ndev, skb); - if (unlikely(!skb)) - goto exit_drop; - } - - err = mhi_queue_skb(mdev, DMA_TO_DEVICE, skb, skb->len, MHI_EOT); - if (unlikely(err)) { - net_err_ratelimited("%s: Failed to queue TX buf (%d)\n", - ndev->name, err); - dev_kfree_skb_any(skb); - goto exit_drop; - } - - if (mhi_queue_is_full(mdev, DMA_TO_DEVICE)) - netif_stop_queue(ndev); - - return NETDEV_TX_OK; - -exit_drop: - u64_stats_update_begin(&mhi_netdev->stats.tx_syncp); - u64_stats_inc(&mhi_netdev->stats.tx_dropped); - u64_stats_update_end(&mhi_netdev->stats.tx_syncp); - - return NETDEV_TX_OK; -} - -static void mhi_ndo_get_stats64(struct net_device *ndev, - struct rtnl_link_stats64 *stats) -{ - struct mhi_net_dev *mhi_netdev = netdev_priv(ndev); - unsigned int start; - - do { - start = u64_stats_fetch_begin_irq(&mhi_netdev->stats.rx_syncp); - stats->rx_packets = u64_stats_read(&mhi_netdev->stats.rx_packets); - stats->rx_bytes = u64_stats_read(&mhi_netdev->stats.rx_bytes); - stats->rx_errors = u64_stats_read(&mhi_netdev->stats.rx_errors); - stats->rx_dropped = u64_stats_read(&mhi_netdev->stats.rx_dropped); - } while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.rx_syncp, start)); - - do { - start = u64_stats_fetch_begin_irq(&mhi_netdev->stats.tx_syncp); - stats->tx_packets = u64_stats_read(&mhi_netdev->stats.tx_packets); - stats->tx_bytes = u64_stats_read(&mhi_netdev->stats.tx_bytes); - stats->tx_errors = u64_stats_read(&mhi_netdev->stats.tx_errors); - stats->tx_dropped = u64_stats_read(&mhi_netdev->stats.tx_dropped); - } while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.tx_syncp, start)); -} - -static const struct net_device_ops mhi_netdev_ops = { - .ndo_open = mhi_ndo_open, - .ndo_stop = mhi_ndo_stop, - .ndo_start_xmit = mhi_ndo_xmit, - .ndo_get_stats64 = mhi_ndo_get_stats64, -}; - -static void mhi_net_setup(struct net_device *ndev) -{ - ndev->header_ops = NULL; /* No header */ - ndev->type = ARPHRD_RAWIP; - ndev->hard_header_len = 0; - ndev->addr_len = 0; - ndev->flags = IFF_POINTOPOINT | IFF_NOARP; - ndev->netdev_ops = &mhi_netdev_ops; - ndev->mtu = MHI_NET_DEFAULT_MTU; - ndev->min_mtu = MHI_NET_MIN_MTU; - ndev->max_mtu = MHI_NET_MAX_MTU; - ndev->tx_queue_len = 1000; -} - -static void mhi_net_dl_callback(struct mhi_device *mhi_dev, - struct mhi_result *mhi_res) -{ - struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev); - const struct mhi_net_proto *proto = mhi_netdev->proto; - struct sk_buff *skb = mhi_res->buf_addr; - int remaining; - - remaining = atomic_dec_return(&mhi_netdev->stats.rx_queued); - - if (unlikely(mhi_res->transaction_status)) { - dev_kfree_skb_any(skb); - - /* MHI layer stopping/resetting the DL channel */ - if (mhi_res->transaction_status == -ENOTCONN) - return; - - u64_stats_update_begin(&mhi_netdev->stats.rx_syncp); - u64_stats_inc(&mhi_netdev->stats.rx_errors); - u64_stats_update_end(&mhi_netdev->stats.rx_syncp); - } else { - u64_stats_update_begin(&mhi_netdev->stats.rx_syncp); - u64_stats_inc(&mhi_netdev->stats.rx_packets); - u64_stats_add(&mhi_netdev->stats.rx_bytes, mhi_res->bytes_xferd); - u64_stats_update_end(&mhi_netdev->stats.rx_syncp); - - switch (skb->data[0] & 0xf0) { - case 0x40: - skb->protocol = htons(ETH_P_IP); - break; - case 0x60: - skb->protocol = htons(ETH_P_IPV6); - break; - default: - skb->protocol = htons(ETH_P_MAP); - break; - } - - skb_put(skb, mhi_res->bytes_xferd); - - if (proto && proto->rx_fixup) - proto->rx_fixup(mhi_netdev->ndev, skb); - else - netif_rx(skb); - } - - /* Refill if RX buffers queue becomes low */ - if (remaining <= mhi_netdev->rx_queue_sz / 2) - schedule_delayed_work(&mhi_netdev->rx_refill, 0); -} - -static void mhi_net_ul_callback(struct mhi_device *mhi_dev, - struct mhi_result *mhi_res) -{ - struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev); - struct net_device *ndev = mhi_netdev->ndev; - struct mhi_device *mdev = mhi_netdev->mdev; - struct sk_buff *skb = mhi_res->buf_addr; - - /* Hardware has consumed the buffer, so free the skb (which is not - * freed by the MHI stack) and perform accounting. - */ - dev_consume_skb_any(skb); - - u64_stats_update_begin(&mhi_netdev->stats.tx_syncp); - if (unlikely(mhi_res->transaction_status)) { - - /* MHI layer stopping/resetting the UL channel */ - if (mhi_res->transaction_status == -ENOTCONN) { - u64_stats_update_end(&mhi_netdev->stats.tx_syncp); - return; - } - - u64_stats_inc(&mhi_netdev->stats.tx_errors); - } else { - u64_stats_inc(&mhi_netdev->stats.tx_packets); - u64_stats_add(&mhi_netdev->stats.tx_bytes, mhi_res->bytes_xferd); - } - u64_stats_update_end(&mhi_netdev->stats.tx_syncp); - - if (netif_queue_stopped(ndev) && !mhi_queue_is_full(mdev, DMA_TO_DEVICE)) - netif_wake_queue(ndev); -} - -static void mhi_net_rx_refill_work(struct work_struct *work) -{ - struct mhi_net_dev *mhi_netdev = container_of(work, struct mhi_net_dev, - rx_refill.work); - struct net_device *ndev = mhi_netdev->ndev; - struct mhi_device *mdev = mhi_netdev->mdev; - int size = READ_ONCE(ndev->mtu); - struct sk_buff *skb; - int err; - - while (atomic_read(&mhi_netdev->stats.rx_queued) < mhi_netdev->rx_queue_sz) { - skb = netdev_alloc_skb(ndev, size); - if (unlikely(!skb)) - break; - - err = mhi_queue_skb(mdev, DMA_FROM_DEVICE, skb, size, MHI_EOT); - if (unlikely(err)) { - net_err_ratelimited("%s: Failed to queue RX buf (%d)\n", - ndev->name, err); - kfree_skb(skb); - break; - } - - atomic_inc(&mhi_netdev->stats.rx_queued); - - /* Do not hog the CPU if rx buffers are consumed faster than - * queued (unlikely). - */ - cond_resched(); - } - - /* If we're still starved of rx buffers, reschedule later */ - if (unlikely(!atomic_read(&mhi_netdev->stats.rx_queued))) - schedule_delayed_work(&mhi_netdev->rx_refill, HZ / 2); -} - -static struct device_type wwan_type = { - .name = "wwan", -}; - -static int mhi_net_probe(struct mhi_device *mhi_dev, - const struct mhi_device_id *id) -{ - const struct mhi_device_info *info = (struct mhi_device_info *)id->driver_data; - struct device *dev = &mhi_dev->dev; - struct mhi_net_dev *mhi_netdev; - struct net_device *ndev; - int err; - - ndev = alloc_netdev(sizeof(*mhi_netdev), info->netname, - NET_NAME_PREDICTABLE, mhi_net_setup); - if (!ndev) - return -ENOMEM; - - mhi_netdev = netdev_priv(ndev); - dev_set_drvdata(dev, mhi_netdev); - mhi_netdev->ndev = ndev; - mhi_netdev->mdev = mhi_dev; - mhi_netdev->proto = info->proto; - SET_NETDEV_DEV(ndev, &mhi_dev->dev); - SET_NETDEV_DEVTYPE(ndev, &wwan_type); - - /* All MHI net channels have 128 ring elements (at least for now) */ - mhi_netdev->rx_queue_sz = 128; - - INIT_DELAYED_WORK(&mhi_netdev->rx_refill, mhi_net_rx_refill_work); - u64_stats_init(&mhi_netdev->stats.rx_syncp); - u64_stats_init(&mhi_netdev->stats.tx_syncp); - - /* Start MHI channels */ - err = mhi_prepare_for_transfer(mhi_dev); - if (err) - goto out_err; - - err = register_netdev(ndev); - if (err) - goto out_err; - - if (mhi_netdev->proto) { - err = mhi_netdev->proto->init(mhi_netdev); - if (err) - goto out_err_proto; - } - - return 0; - -out_err_proto: - unregister_netdev(ndev); -out_err: - free_netdev(ndev); - return err; -} - -static void mhi_net_remove(struct mhi_device *mhi_dev) -{ - struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev); - - unregister_netdev(mhi_netdev->ndev); - - mhi_unprepare_from_transfer(mhi_netdev->mdev); - - free_netdev(mhi_netdev->ndev); -} - -static const struct mhi_device_info mhi_hwip0 = { - .netname = "mhi_hwip%d", -}; - -static const struct mhi_device_info mhi_swip0 = { - .netname = "mhi_swip%d", -}; - -static const struct mhi_device_id mhi_net_id_table[] = { - /* Hardware accelerated data PATH (to modem IPA), protocol agnostic */ - { .chan = "IP_HW0", .driver_data = (kernel_ulong_t)&mhi_hwip0 }, - /* Software data PATH (to modem CPU) */ - { .chan = "IP_SW0", .driver_data = (kernel_ulong_t)&mhi_swip0 }, - {} -}; -MODULE_DEVICE_TABLE(mhi, mhi_net_id_table); - -static struct mhi_driver mhi_net_driver = { - .probe = mhi_net_probe, - .remove = mhi_net_remove, - .dl_xfer_cb = mhi_net_dl_callback, - .ul_xfer_cb = mhi_net_ul_callback, - .id_table = mhi_net_id_table, - .driver = { - .name = "mhi_net", - .owner = THIS_MODULE, - }, -}; - -module_mhi_driver(mhi_net_driver); - -MODULE_AUTHOR("Loic Poulain "); -MODULE_DESCRIPTION("Network over MHI"); -MODULE_LICENSE("GPL v2");